Heat saving unit



June 16, 1959 B. HANSEN HEAT SAVING UNIT 2 Sheets-Sheet 1 Filed Sept. 5, 1956 FIG. 2.

INVENTOR. Bernard Hansen FIG. 3.

ATTORNEY Jun 16, 1959 B. HANSEN HEAT SAVING UNIT 2 Sheets-Sheet 2 Filed Sept. 5. 1956 FIG.4.

FIG. 5.

INVENTOR. Bernard Hansen :f/ 7

AT TORNE Y States invention-relates to a heat saving-unit adapted to be attached to the smoke flue pipe of a furnace or stove; It is the principal object of the present invention to; provide a-heat saving unit which can be fitted upon a.

smoke flue pipe section so that it surrounds the same and through the ends of which air may be drawn for de- WIYofheatGd air to a room or a part of the basement removedh'ornthe furnace or stove and not ordinarily heatedthereby and the heat being taken with no increase in fuel cost since the heat would ordinarily pass into the chimney and be wasted.

It is another object of the invention to provide a heat saving unit forniedofparts that can be assembled upon the chimney flue or stove pipe section upon removal of the stove pipe from the chimney hue and which becomes apart of the unit and can be placed the chimney ,flue along with the, parts thereof to provide a 'unit from which the heated air can be taken. 1 a

,It is still another object of the invention to provide a heat saving unit formed of an assembly of parts made upon a chimney fluefpipewhere the air entering the ends of the unit is; deflected radially-inwardly in, multiplepaths when being drawn through the unit and onto diilerent areas of the external surface of the chimney flue pipe center to give a full wiping effect upon the chimney pipe surface throughout substantially the entire length of the line pipe .before being extracted radially-outwardly and through the outlet part.

It is a further object of the invention to provide a heat saving unit that has the air entering the opposite ends of the unit wherein an automatic temperature regulator valve is provided on the ends of the unit so that the inflow of the air will be kept out down in volume when the chimney pipe is not running as hot as it might be running when the furnace is being run at its maximum heat capacity.

Other objects of the invention are to provide a heat saving unit for chimney flue pipes, which, having the above objects in mind, is of simple construction, has a minimum number of pants, inexpensive to manufacture, compact, durable, easy to install, eflicient and elfective in use.

For a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which Figure 1 is a perspective view of the heat saving unit assembled upon the chimney flue leading from the furnace to the chimney and looking upon the front end of the unit,

Fig. 2 is an enlarged perspective view of the heat saving unit removed from its assembled connection with the furnace and chimney and its outer shell broken away to show the internal wall and looking upon the opposite end of the unit from that shown in Fig. 1,

Fig. 3 is an enlarged vertical sectional view taken upon line 3-3 of Fig. 1,

2,890,866 Patented J une 16, 1959 ice 2 Fig. 4 is a longitudinal sectional view of the inner shell, 7

Fig. 5 is an elevational view of the chimney flue section and the inner deflecting units assembled thereupon, Fig. 6 is an end elevational view of the forward end of the unit and looking upon the air control valve thereof and the bimetallic elements for actuating the same; and t 1 L Fig. 7 is an enlarged fragmentary sectional view iof the end plate assembly as viewed on line 7-7 of Fig-6x1 Referring now tothe drawings, 10 represents a furnace having the usual hot air pipe outlets 11 extending up, wardly therefrom and a chimney line 12 extending from the furnace to a chimney 13. This chimneytflue includes a chimney flue section 12 on which a heatsavingfunit' 15 is assembled. This heat saving unit has an outletpipe 16 through which heated air is. delivered to an upstairs room or space in the basement removed from the furnace and not ordinarily heated by the furnace. The heat saw ing unit 15- in addition to the chimney pipe section 12.

l comprises deflector assemblies 17 and 18 that surround.

the pipe section 12 and are mounted on the ends; of an, inner shell 19 having a nipple. opening 20 to whic h the: outlet pipe 16 is connected. An outer shell 21 surrounds: the inner shell and concentric therewith so as to provide: a dead airspace 22 therebetween. Spacing rings" 23 ancl 24 are provided on the opposite ends of the shells tomaintain their concentric relationship with. one another.. The outer shell has inwardly-extending integral flanges:

, 25 and 26to which the respective rings 23 and are:

secured against rotationby respective pins- 27 and 28;. The flanges 25 and 26 respectively have acircular row' of radial slots 25' and 26 therein throughwliioh the fair: enters the opposite ends offltheunitf f Thetub'e assembly 17 is formedof an ihi'lr sliiirtl tapered tube 29rand an outerlong tapered tub=30. The? long tapered tube 30 is of larger diameter than the short: tube 29 so that an intermediate space 31 is providedi therebetween through which air is directed from the endl of the unit to an area on the chimney flue section 12 be-- yond the end of the short tube 29. The air entering; space 32 immediately surrounding the chimney flue sec tion 12' will immediately contact the chimney flue section 12' on entering the unit and will join with the air entering space 31. Accordingly a multiple heating effect is had upon the air entering the forward end of the unit. The tubes 29 and 30 are secured together by bolt 33 and nuts 34 and are held in spaced concentric relationship with one another and within the inner shell 19 by spacing elements 35 and 36. The bolts 33 extend into slots 38 and are held against inward displacement by their heads 33'. The tubular assembly 18 is similarly constructed but is made up of three tapered tubular deflecting elements 40, 41 and 42 of different lengths and adapted to conduct the air entering the rear end of the unit to three different areas of the flue section 12'. This assembly provides spaces 43, 44 and 45 through which the air is caused to pass. These deflecting elements are held in concentric relationship with one another and within the inner shell by bolts 47 and nuts 48 and spacing elements 49, 50 and 51. The bolts 47 are slid into notches 52 and. held against inward displacement by their heads 47'.

On the end flange 25 is an annular valve member 55' having outwardly angularly struck projections 55" adapted to overlie the openings 25' of the end flange 25 to cause the air to be directed thereinto at an angle so that it will pass in a spiral manner through the tubular assembly 17 and over the flue section 12". The valve member 55 has diametrically opposite arcuate slots 56- tbrough which the pins 27 extend and limit the angular movement of the valve member 55 over the valve mem-- her there is fixed on an angle support ring 57. This valve member 5'5 can be adjusted by hand but is preferably adjusted by angularly spaced bimetallic elements 58 mounted upon the retaining ring 57 and engaging with pins 58 in the periphery of the valve member 55.-

The amount of heat surrounding the line will control the amount of the opening of the valve member. With the greater heat, the opening space will be greater. On the opposite end of the unit is a valve member 59 having struck projection 59. An angle ring 60 on the opposite end of the outer shell 21 supports bimetallic elements 61 that engage with pins 62 on the valve plate 26. This valve member 59 operates in the same manner that the valve member 55 operates. With the provision of the dead air space 22 between the inner and outer shells 19 and 21 the heat loss from the exterior of the unit is kept low.

It should now be apparent that there has been provided a heat saving unit adapted to be assembled upon a fluid pipe section in which the air enters the opposite ends of the unit to wipe across the exterior surface of the pipe section and simultaneously at difierent areas thereof and joining within the unit for delivery to the outlet pipe 16. A suction fan will be provided in the outlet pipe to establish a constant flow of air through the unit.

It will also be seen that the amount of air passing the end valves will be automatically controlled in accordance with the temperature of the surrounding atmosphere about the chimney flue pipe.

While various changes may he made in the detailed construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

What is claimed is:

1. A heat saving unit for a chimney flue section comprising an outer shell, an inner shell in the outer shell surrounding the flue section, a plurality of difierent length tapered tubes of frusto-conical shape in spaced relationship and secured to and within the inner shell at each end of the inner shell providing air travel spaces therebetween through which air is directed on being drawn through the unit from both ends thereof by means of inlets at said ends to cause multiple streams of air to simultaneously engage different areas of the chimney flue section, the inner shell having an opening therein, and an outlet pipe connected to the inner shell at the opening therein, and extending through the outer shell so that the air drawn through the tapered tubes may pass as heated air out of the unit. 7

2. A heat saving unit as defined in claim 1, and said multiple tubular assembly having bolt means for securing the tubular means together and retaining the same in spaced relationship to one another and said inner shell having notches in the end thereof for receiving the bolt means to hold the tubular assembly against inward displacement upon the inner shell.

3. A heat saving unit as defined in claim 1, and an end;

flange on the inner shell having angularly spaced open ings, a valve member having angularly spaced struck portions forming angularly spaced openings and intenmedi ate port-ions adapted to overlie the end flange openings, said valve member being angularly adjustable to control the amount of air entering under the struck portions, said struck portions thereby causing the to be deflected as it enters the unit.

References Cited in the file of this patent UNITED STATES PATENTS 

